I think there's precious few themes that could sell 10,000 machines anymore.
Star Wars? Maybe.... if Stern does it right (thats a big "if"). But that'd be the what, 4th SW pin?
I think a Harry Potter pin could come close, but not if JJP does it. NOT a slam on JJP, but they don't do "pro-priced" machines and, as such, probably could match the volume Stern does.